Machinery for the manufacture of satchel-bottom paper bags



3 Sheets-Sheet 2;

(No Model.)

W. C. CROSS.

MAGHINERY POR THE MANUPAGTURE OPSATGHEL BOTTOM PAPER BAGS.

No. 336,474 Patented Feb. 16, 1886.

N. PETERS. Phom-Limognphur. wnshinglon. D. C.

(No Model.)

3 Sheets-Sheet 3. W. O. CROSS.

MACHINERY POR THE MANUPAGTURE OP SATGHEL BOTTOM PAPER BAGS.

No. 336,474. Patented Peb. 16, 1886.

NA PETERS. PwlwL'Ahugmphen Wzshingn, DA C.

UNITED STATES PATENT OEEICE. y

VILLIAM O. CROSS, OF BOSTON, MASSACHUSETTS.

MACHINERY FOR THE NIANUFACTURE OF SATCHEL-BOTTOM PAPER BAGS.

SPECIFICATION Iming part of Letters Patent No` 336,474, dated February 16,1886.

Application tiled October 523, lSS. Serial No. 130,12.

T0 all whom it may concern:

Be it known that I, WILLIAM C. Onoss, of Boston, Massachusetts, have invented certain new and useful Improvements in Machinery for the Manufacture of Satchel-Bottom Paper Bags, of which the following is a specification.

I have heretofore patented a variety of machinery for the manufacture of Satchel-bottom paper bags.

My present invention relates to machinery of a like general class, althoughthe bag which it is intended to make, while it may be considered a Satchel-bottom paper bag in the sense that the front end of the bag-blank is opened and folded back in approximately diamond shape to form the tirstfold, and then the front and rear flaps of said first fold are folded inwardly, one upon the other, to form the second and final folds, nevertheless differs in some respects from the ordinary satchelbottom paper bag described in my previous patents.

In the bag to the manufacture of which my present invention is mainly directed thefront end of the blank is opened and laid back as usual; but preliminary to this operation there are formed in the front end portion of the bag-blank two parallel longitudinal slits passing through both sides or plies ot' the blank, and of a length equal or nearly equal to that. which it is desired thetlaps for the second and nal folds should have. The consequence of this is, that when the iirst fold is laid this fold has not the customary diamond form, but at its front and rear terminates not in points, but in tlaps. The longitudinal meet-ing edges of the parts which make up the body ot' the first fold also overlap. It is to properly lay a fold of this character that I have devised my present invention.

The organization in which I prefer to embody my invention is that described in my Letters Patent No. 325,059, of August 25, 1885. I use the same instrumentalities, operating together in the same way,asin said Let ters Patent. I however' add cutters for making the longitudinal slits referred to, and I also modify theguideiinger and add to it certain instrumentalities to enable it to efficiently lay a first fold of the kind above generally described. It is in these changesin and addi- (Xo model.)

tions to the guide-linger that my invention mainly is comprised, althouglr it also ernbraces other features, hereinafter described, which conduce to the proper laying of the fold.

The invention can best be explained and understood by reference to the accompanying drawings, in which- Figure l is a longitudinal vertical section, and Fig. 2 is a plan,of so much of the machine shown in my aforesaid, Letters Patent No. 325,059 as needed for the purpose of illustraling my present invention. Fig. 3 is a view on enlarged scale of my improved guideiinger detached. Fig. 4 is a plan, and Fig. 5 is a rear elevation,ot' t-hesame. Figs. G, 7, and 8 are views of the blank.

In the drawings, A is the former. BB are the lip-cutting rolls. C C are the feed-rolls. D D are the rolls carrying sprocket'wheels E E. F F are sprocket-wheels, which, in conjunction with E E, carry sprocket-chains G, on which are mounted the plateknife folders II. K K are the rolls by which the iirst fold is pressed down and the uncut central portion that comiects'successive blanks is severed. t' is the spring opener-strip, and I is the guidefinger. The general construction, combination, and Inode of operation of these parts are the same as described in my aforesaid Letters Patent, with reference tothe correspondinglylettered `parts therein shown, and require, therefore, no explanation here. I consequently proceed to describe the parts in which my invention is comprised.

On the upper roll, D, are two blades, a a, I

extending partly around the roll, parallel with one another, and of such length and at such distance apart as to form parallel slits of the proper length 'in the blank at the proper points. Fig. 6 represents a blank thus slitted, the slits .c x extending through both plies of the blank. The guidetinger I is attached to the cross-harm. To it is connected a flat plate, b, .which I term the forrner'platef7 This former'plate is beneath the guide-finger, and extends from the tip of the latter back a suitable distance. It is of a width about equal to the dist-ance between the slits x a in the blank, and its front edges, c c, slant backward and divergently from the tip of the finger, and are made "sharp, for a purpose hereinafter eX- IOO plained. Between the finger (in rear of its tip) and the former-plate intervenes a plate, d, inclined as shown, which plate--termed by me the lap-guide7-is intended to insure the propel lapping of the meeting edges of the parts which form the body of the rstfold.

rIhe blank, as it is slitted at x, passes to the guide nger,(its mouth being held open by the opener L) and by the conjoint action of the linger and one of the plate-knife folders the first fold is laid. As this fold-is being formed, the former-plate, which is of the width of the flaps formed by slits x and is adjusted in line with the iiaps, presses upon or holds the central portion of the fold, whereby the latter is brought ultimately to the shape shownin Fig. 7, which represents the blank after the first fold is laid. It will be noted that the longitudinal meeting edges of the two parts y y, which form the body of the first fold, overlap. It is with a view to insure this overlapping that the lap-guide d is made use of. lIl he parts y (which may in a sense be considered side flaps) pass above the former-plate, and their meeting` edges pass one on each side of the finger. They thus travel along in Contact with opposite faces ofthe lapguide,and,owing to the inclination of the latter, the edge which travels along the face d will be held 'higher than the edge which travels in contact with the face d2, so that as the two edges pass beyond the lap guide and are permitted to come together the higher one will lap over the other with certainty. The sharpening of the edges c is intended to allow the former -plate to slightly cut the blank at the points a in case the blank should be not exactly in line with said plate.

The blank, with the first fold laid, passes beyond the guide-finger to the rolls K K. To prevent the upper roll, K, from butting or pushing against the front edges of the parts y, and thus disturbing the fold, I recess this roll at the point n, the recess being so placed that it will come opposite to the blank at the time the latter has traveled far enough to bring the parts y up to the rolls K K. The f'ront edges of the parts y consequently will not contact with the upper roll, K, but the latter at the front wall, M, ofthe recess will take hold of the parts y at a point back of their front edges.

To facilitate the laying of the first or diamond fold, I recess the feed-rolls C at the ends, as indicated at s, with a view to breaking down and creasing the side edges of the yet unfolded blank from the front or forward end of the blank to a point-say x', Fig. 6-just at or in advance of the cross-line of fold determined by the plate-knife folder, leaving the side edges in rear of that point uncreased. The object of this primarily is to obtain what may be termed. a hingepoint/7 on which the top ply or fiap can readily turn over and down upon the plate-knife folder. I find also in practice that the creasing of the edges between the points fr and the forward end of the blank facilitates and renders more easy the operation of laying the fold.

I have shown and described the formerplate as attached to and carried by the guidenger. It may, however, be carried by an independent support. The same is true also of the lap-guide. I prefer, however, to mount both of them on the guide-finger. I have also described and prefer to use a plate-knife folder rotating or moving continuously in one dircction 5 but other known arrangments of this device might be employed.

After the blank passes the rolls K K the first fold is pasted in the usual way, and the end fiaps are then by suitable mechanism folded inwardly, so as to overlap, thus finishing the bag, the bottom of which will have the form illustrated in Fig. 8. These pasting and folding operations can be performed by the mechanism described in my Letters Iatent No. 325,059, hereinbefore referred to, or by any other instrumentalities suitable for the purpose.

Having described my improvements and the best way at present known to me of carrying the same into effect, what I claim herein as new and of my own invention is l. The combination of the guide-finger, thc former-plate, and the plate-knife folder, substantially as and for the purposes hereinbefore set forth.

2. The combination of the slitting-rolls, the guide-finger, the former-plate, and the plateknife folder, substantially as and for the purposes hereinbefore set forth.

3. The guide-finger provided with a formerplate, as hereinbefore shown and described.

4. 'Ihe lap-guide, in combination with the guide-finger and former-plate, substantially as and for the purpose hereinbefore set forth.

5. The combination, substantially as hereinbefore set forth, of the slitting-rolls, the guide-iinger, the former-plate, the lap-guide, and the plate-knife folder.

6. The combination, with the former, the plate-knife folder, and the guidedinger, of the feed-rolls C, recessed at the points specified, to break down or crease the side edges of the blank from the front end thereof to a point justin advance of the cross-line of fold determined by the plate-knife folder, substantially as and for the purposes set forth.

7. The combination, with the plate-knife folder, the former-plate, and the guide-finger, of the roll K, recessed at the point specified, to provide a bearing-edge, n,which shall overlap the front edges of the parts y ofthe blank, substantially as and for the purposes hereinbefore set forth.

In testimony whereofI have signed my name to this specificatiomin the presence of two subscribing witnesses, on this 2d day of October, A. D. 1885.

IV. C. CROSS.

/Vitnesses:

MARcELLUs BAILEY, J. E. VAN DoREN.

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